Paintball doesn't translate very well into airsoft. I have done paintball for 21 years including 24 hour games..they are NOT the same thing as a true airsoft milsim. Get rid of that mentality right now.
Practice practice practice and more practice. Build a kit, play it out and see what works and what doesn't. I have played skirmish airsoft for 5 years now and know I do not have a milsim ready kit.

I would suggest you play some full day skirmishes and go from there.
I don't know. Not a pro so take it or leave it.